"If Russia wants to help address the humanitarian crisis it created, it should…contribute to the UN's Humanitarian Response Plan," the statement said.

The U.S. statement also expressed concern for those "brave enough to speak out against Russia's occupation of Crimea," particularly Crimean Tatars. It said Crimean Tatars are persecuted "with impunity" and cited "ongoing raid on Tatar homes" and arrests "on trumped-up charges."

Russia annexed the Ukrainian region of Crimea in March 2014, prompting international condemnation and sanctions.

The U.S. statement noted that Russian officials have said the conflict in Ukraine is tantamount to a "civil war."

"We all know the truth – the brutal war in Donbas is fomented and perpetuated by Russia," the statement countered.

The statement concluded by saying: "We do not, nor will we ever, recognize Russia's occupation and purported annexation of Crimea. Crimea-related sanctions on Russia will remain in place until Russia returns full control of the peninsula to Ukraine."

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